<template>
  <div class="course-create-or-edit">
    <el-card>
      <div slot="header">
        <!-- 步骤条 -->
        <el-steps :active="activeStep" simple>
          <el-step
            v-for="(item, i) in steps"
            :key="item.id"
            :title="item.title"
            :icon="item.icon"
            @click.native="activeStep = i"
          ></el-step>
        </el-steps>
      </div>
      <!-- 步骤对应的表单结构 -->
      <el-form label-width="80px">
        <!-- 基本信息 -->
        <div v-show="activeStep === 0">
          <el-form-item label="课程名称">
            <el-input v-model="course.courseName"></el-input>
          </el-form-item>
          <el-form-item label="课程简介">
            <el-input v-model="course.brief"></el-input>
          </el-form-item>
          <el-form-item label="课程概述">
            <el-input
              v-model="course.previewFirstField"
              placeholder="概述1"
              style="width: 49%; min-width: 300px; margin-right: 15px"
            >
              <template slot="append"
                >{{ course.previewFirstField.length }}/20</template
              >
            </el-input>
            <el-input
              v-model="course.previewSecondField"
              placeholder="概述2"
              style="width: 49%; min-width: 300px"
            ></el-input>
          </el-form-item>
          <el-form-item label="讲师姓名">
            <el-input v-model="course.teacherDTO.teacherName"></el-input>
          </el-form-item>
          <el-form-item label="讲师简介">
            <el-input v-model="course.teacherDTO.description"></el-input>
          </el-form-item>
          <el-form-item label="课程排序">
            <el-input-number
              v-model="course.sortNum"
              label="描述文字"
              controls-position="right"
            ></el-input-number>
          </el-form-item>
        </div>
        <!-- 课程封面 -->
        <div v-show="activeStep === 1">
          <!-- 封装为图片上传组件 -->
          <course-image
            v-model="course.courseListImg"
            label="课程封面"
            :limit="3"
          ></course-image>
          <course-image
            v-model="course.courseImgUrl"
            label="解锁封面"
          ></course-image>
        </div>
        <!-- 销售信息 -->
        <div v-show="activeStep === 2">
          <el-form-item label="售卖价格">
            <el-input v-model="course.discounts" type="number" :min="0">
              <template slot="append">元</template>
            </el-input>
          </el-form-item>
          <el-form-item label="商品原价">
            <el-input v-model="course.price" type="number" :min="0">
              <template slot="append">元</template>
            </el-input>
          </el-form-item>
          <el-form-item label="销量">
            <el-input v-model="course.sales" type="number" :min="0">
              <template slot="append">单</template>
            </el-input>
          </el-form-item>
          <el-form-item label="活动标签">
            <el-input v-model="course.discountsTag"></el-input>
          </el-form-item>
        </div>
        <!-- 秒杀信息 -->
        <div v-show="activeStep === 3">
          <el-form-item label="限时秒杀开关" label-width="120px">
            <el-switch
              v-model="course.activityCourse"
              active-color="#13ce66"
              inactive-color="#ff4949"
            >
            </el-switch>
          </el-form-item>
          <template v-if="course.activityCourse">
            <el-form-item label="开始时间">
              <el-date-picker
                v-model="course.activityCourseDTO.beginTime"
                type="datetime"
                placeholder="选择日期时间"
              >
              </el-date-picker>
            </el-form-item>
            <el-form-item label="结束时间">
              <el-date-picker
                v-model="course.activityCourseDTO.endTime"
                type="datetime"
                placeholder="选择日期时间"
              >
              </el-date-picker>
            </el-form-item>
            <el-form-item label="秒杀价">
              <el-input
                v-model="course.activityCourseDTO.amount"
                type="number"
                :min="0"
              >
                <template slot="append">元</template>
              </el-input>
            </el-form-item>
            <el-form-item label="库存">
              <el-input
                v-model="course.activityCourseDTO.stock"
                type="number"
                :min="0"
              >
                <template slot="append">个</template>
              </el-input>
            </el-form-item>
          </template>
        </div>
        <!-- 课程详情 -->
        <div v-show="activeStep === 4">
          <el-form-item label="课程详情">
            <text-editor
              v-model="course.courseDescriptionMarkDown"
            ></text-editor>
          </el-form-item>
          <el-form-item label="是否上架">
            <el-switch
              v-model="course.status"
              active-color="#13ce66"
              inactive-color="#ff4949"
              :active-value="1"
              :inactive-value="0"
            ></el-switch>
          </el-form-item>
          <el-form-item>
            <el-button type="primary" @click="handleSave">保存</el-button>
          </el-form-item>
        </div>
        <!-- 下一步按钮 -->
        <el-form-item v-if="activeStep !== steps.length - 1">
          <el-button @click="activeStep++">下一步</el-button>
        </el-form-item>
      </el-form>
    </el-card>
  </div>
</template>

<script>
import CourseImage from "./CourseImage";
import { saveOrUpdateCourse, getCourseById } from "@/services/course";
import TextEditor from "@/components/TextEditor";

export default {
  name: "CourseCreateOrEdit",
  props: {
    isEdit: {
      type: Boolean,
      default: false,
    },
    courseId: {
      type: [String, Number],
    },
  },
  components: {
    CourseImage,
    TextEditor,
  },
  created() {
    // 检测当前是否为编辑功能，如果是，根据 courseId 请求课程数据
    if (this.isEdit) {
      this.loadCourse();
    }
  },
  data() {
    return {
      // 步骤的进度
      activeStep: 0,
      // 步骤条的相关信息
      steps: [
        { id: 1, title: "基本信息", icon: "el-icon-edit" },
        { id: 2, title: "课程封面", icon: "el-icon-upload" },
        { id: 3, title: "销售信息", icon: "el-icon-picture" },
        { id: 4, title: "秒杀信息", icon: "el-icon-picture" },
        { id: 5, title: "课程详情", icon: "el-icon-picture" },
      ],
      // 本地预览图片地址
      imageUrl: "",
      // 添加课程的相关信息
      //   - 将数据中与 ID 相关的数据去除，因为是编辑功能使用的
      course: {
        // id: 0,
        // 课程名称
        courseName: "",
        // 课程介绍
        brief: "",
        teacherDTO: {
          // id: 0,
          // courseId: 0,
          // 讲师名称
          teacherName: "",
          teacherHeadPicUrl: "",
          position: "",
          // 讲师介绍
          description: "",
        },
        // 课程详情内容
        courseDescriptionMarkDown: "<h3>默认值</h3>",
        // 商品原价
        price: 0,
        // 售卖价格
        discounts: 0,
        priceTag: "",
        // 活动标签
        discountsTag: "",
        isNew: true,
        isNewDes: "",
        // 课程封面地址
        courseListImg: "",
        // 解锁封面地址
        courseImgUrl: "",
        // 课程排序
        sortNum: 0,
        // 概述1
        previewFirstField: "",
        // 概述2
        previewSecondField: "",
        // 上架状态，默认值 0 代表不上架，1 代表上架
        status: 0,
        // 销量
        sales: 0,
        // 参与秒杀活动的课程
        activityCourse: false,
        activityCourseDTO: {
          // id: 0,
          // courseId: 0,
          // 秒杀活动开始时间
          beginTime: "",
          // 结束时间
          endTime: "",
          // 秒杀活动价格
          amount: 0,
          // 秒杀库存
          stock: 0,
        },
        autoOnlineTime: "",
      },
    };
  },
  methods: {
    // 编辑功能根据 ID 加载课程信息
    async loadCourse() {
      const { data } = await getCourseById(this.courseId);
      if (data.code === "000000") {
        // - 判断当前课程是否为开启秒杀的状态，如果未开启秒杀，需要初始化数据
        if (!data.data.activityCourse) {
          data.data.activityCourseDTO = {
            beginTime: "",
            endTime: "",
            amount: 0,
            stock: 0,
          };
        }
        this.course = data.data;
      }
    },
    // 保存功能
    async handleSave() {
      const { data } = await saveOrUpdateCourse(this.course);
      if (data.code === "000000") {
        this.$message.success(`${this.isEdit ? "编辑" : "添加"}课程成功`);
        this.$router.push({
          name: "course",
        });
      }
    },
  },
};
</script>

<style lang="scss" scoped>
.el-step {
  cursor: pointer;
}
</style>
